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Hi everyone, just an update here to let you know the problem with the GPS not getting picked up by the MFD was fixed by grounding the NMEA2000 power drop cable. I also installed the resistor to the GPS TX that limits the refresh to 1Hz, just in case. Anyhow, if it works... don't fix it
Also, I installed the GWI10 Wind Sensor on the masthead and that works flawlessly. The depth transducer is still a bit erratic in behavior but I reserve final judgement until the boat is in the water.

Now, let's see if I can pinpoint why my nav lights and steaming light don't work after switching to LED bulbs (god, I hate electrical systems and climbing the mast just to check if current reaches the steaming light fixture)

Some info: The boat is on the hard and the depth sounder gave readings at some point when pointed either to the ground below or to thick GRP sections of the boat itself (incorrect depths to be exact - probably because it gets readings through the air and not water)

In the manual I used it says that GMI 10 DOES NOT get power through the NMEA2000 network. In fact, I tried both ways, and GMI 10 DID turn on when only powered by the NMEA2000 bus. In either case the results were the same.
I will give the common ground thing a go when I get back to the boat, since it seems the only thing that makes some sense to affect normal operation by cancelling noise on the data lines and the one thing I haven't tried.

Again, thank you all for chiming in.

It appears that versions of the GMI 10 since 2008 have been powered by NMEA 2000. So either you bought some very old stock, or that's the wrong manual for yours.

I don't think depth transducers work reliably in air. Try it in a bucket of water?

Some info: The boat is on the hard and the depth sounder gave readings at some point when pointed either to the ground below or to thick GRP sections of the boat itself (incorrect depths to be exact - probably because it gets readings through the air and not water)

In the manual I used it says that GMI 10 DOES NOT get power through the NMEA2000 network. In fact, I tried both ways, and GMI 10 DID turn on when only powered by the NMEA2000 bus. In either case the results were the same.
I will give the common ground thing a go when I get back to the boat, since it seems the only thing that makes some sense to affect normal operation by cancelling noise on the data lines and the one thing I haven't tried.

The plot thickens, because on the Garmin website there are two versions of the instructions. If you look at the diagrams on pages 5 / 6, the thing that has changed is, (guess what!) in the newer version the + supply is no longer connected to the GMI 10 via the NMEA 0183 connector - only to the GPS sensor.

The two manuals reflect a change to later versions of the GMI 10, which get their power via NMEA 2000. It seems that if the OP has the newer version, he is using the old, wrong, instructions.